Promises | Ep 02 Season 02 - Namaste JavaScript | Summary and Q&A

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October 8, 2022
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Akshay Saini
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Promises | Ep 02 Season 02 - Namaste JavaScript

TL;DR

Promises are objects that represent the eventual completion of an asynchronous operation, providing trust and control in handling async code.

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Key Insights

  • 💨 Promises provide a better way to handle async operations in JavaScript, improving code organization and readability.
  • 🎮 Callbacks can lead to inversion of control, where the control of the program is given to external APIs.
  • 👻 Promise chaining allows for a cleaner and more structured code flow, avoiding the callback hell problem.
  • 🤙 Promises offer trust and control in handling async code, ensuring that callbacks are called only when the promise is fulfilled.
  • ❓ Promise objects have three possible states: pending, fulfilled, and rejected.
  • 🧭 Promises are immutable and can be passed around without worrying about data mutation.
  • 👻 The fetch function in JavaScript returns a promise, allowing for API calls and handling the response in a promise chain.
  • 🤙 Promises offer a guarantee of calling a callback function once the promise is fulfilled, avoiding the uncertainty of callback functions.

Transcript

promises yes so promise is the most important topic you should know if you are a JavaScript developer if you are giving a front-end interview then definitely 100 percent there will be questions around promises knowing promises will not just help you in your interviews but will also help you become a better JavaScript developer while you are doing y... Read More

Questions & Answers

Q: What is a promise in JavaScript?

A promise is an object that represents the eventual completion of an asynchronous operation. It provides a way to handle async code in a more organized and efficient manner.

Q: Why are promises important in JavaScript?

Promises are important because they solve the issue of inversion of control, allowing developers to have more control over their code. They also provide a clean and readable way to handle asynchronous operations, avoiding callback hell and improving code structure.

Q: How are promises different from callbacks?

Promises offer a more structured and organized way to handle asynchronous code compared to callbacks. With promises, developers can chain multiple async operations together and handle them in a sequential and readable manner.

Q: How does promise chaining work?

Promise chaining allows developers to attach multiple callbacks to a promise, creating a chain of operations that are executed in a specific order. Each callback receives the result of the previous operation and can perform further processing on it.

Q: What is a promise in JavaScript?

A promise is an object that represents the eventual completion of an asynchronous operation. It provides a way to handle async code in a more organized and efficient manner.

More Insights

  • Promises provide a better way to handle async operations in JavaScript, improving code organization and readability.

  • Callbacks can lead to inversion of control, where the control of the program is given to external APIs.

  • Promise chaining allows for a cleaner and more structured code flow, avoiding the callback hell problem.

  • Promises offer trust and control in handling async code, ensuring that callbacks are called only when the promise is fulfilled.

  • Promise objects have three possible states: pending, fulfilled, and rejected.

  • Promises are immutable and can be passed around without worrying about data mutation.

  • The fetch function in JavaScript returns a promise, allowing for API calls and handling the response in a promise chain.

  • Promises offer a guarantee of calling a callback function once the promise is fulfilled, avoiding the uncertainty of callback functions.

  • Understanding promises is crucial for JavaScript developers, not only for interviews but also for writing better code in day-to-day development.

Summary & Key Takeaways

  • Promises are used to handle asynchronous operations in JavaScript, providing a better way to write and manage async code.

  • Promises solve the issue of inversion of control when using callbacks, giving developers more control over their code.

  • Promise chaining allows for a cleaner and more readable code structure, avoiding the callback hell problem.

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